What is a mastermind group?
The format itself — five to seven people, a real cadence, a working agenda. What actually happens inside a mastermind group meeting and what separates rooms that produce from rooms that drift.
A mastermind group is the working format — five to seven people, sometimes as many as ten, who meet on a real cadence around real work, with real commitment to each other. It is the most common modern expression of the mastermind principle, and the thing most people now mean when they say “I’m in a mastermind.”
This post is the deep dive on the format itself: what a group is, what happens inside a meeting, and what distinguishes rooms that produce from rooms that slowly drift. For the broader explanation of what “mastermind” means in all its senses, start with What is a mastermind?. For an essay on what the format actually produces, see Mastermind groups and collective potential.
What a group is
A mastermind group is not a networking circle. It is not a course with discussion. It is not a Slack channel. It is a small, consistent room of peers who meet on a real cadence to work on each other’s actual problems.
Five to seven is the size most strong groups settle into. Smaller than five and the room loses redundancy — one absence undermines the meeting. Larger than seven and individual airtime collapses; members start skipping because they got nothing the last two times. The number is not magic but the range is empirical: working rooms tend to cluster there for structural reasons.
The members are peers, in a specific sense. Not equals in net worth or audience size or revenue, but at comparable working levels — people who can engage seriously with each other’s problems. A founder who just raised a Series A and a founder still on the side hustle will not produce a working room together; their problems are different enough that engagement becomes one-directional. The room works when the problems are adjacent but different: close enough that the language transfers, different enough that members can see each other’s blind spots.
The aim is real work, not personal growth in the abstract. Working rooms have something specific the members are doing — building businesses, growing audiences, advancing careers, working on bodies of creative work. “Mutual support” is not specific enough to organize a room around. The aim has to be concrete enough that members can tell each other when they are off it.
What happens in a meeting
A working mastermind meeting has a structure. The variants are minor; the structure is fairly consistent across rooms that last.
Check-in or commitments review. The group opens by reviewing what each member committed to last meeting. This is not optional. Without it, commitments become aspirational and the meeting drifts into status reports. A real review — what did you commit to, what did you do, what did you not do, why not — is what makes the accountability function actually work.
Hot seat or round-robin. This is the working portion. In a hot-seat format, one member brings a specific problem and the room works on it for thirty to forty-five minutes — clarifying questions first, then perspectives, then options. In a round-robin format, every member gets a shorter slot (ten to fifteen minutes) to bring something. Different rooms find different formats fit their cadence; the principle is the same: members bring real problems and the room engages with them seriously.
New commitments. Before the meeting ends, every member states what they will do before the next session. Specific. Measurable. Witnessed. The commitments become the input to the next meeting’s review. The loop closes.
Facilitation. Someone holds time, holds format, and surfaces what is being avoided. This is a real role. In stronger rooms it rotates; in some rooms one person owns it. In all rooms it has to actually happen — without facilitation, meetings degrade into the longest-talking member’s monologue.
The cadence that holds for most working rooms is every other week. Weekly is too frequent for substantive commitments to mature between sessions; monthly is too sparse for context to stay warm. Bi-weekly is what most strong groups converge on.
What makes a group work
There are a small number of properties that distinguish rooms that compound from rooms that decay. I have written about the architecture in detail elsewhere (Building a better mastermind group, How to run a mastermind group). The condensed version:
A specific aim. The group exists for a particular kind of work, not for connection in the abstract.
Comparable commitment levels. Mixing serious and casual members slowly poisons the room. The serious members eventually drift to a room where everyone is serious.
Adjacent but different domains. Same level, different angle.
A format the group can run on autopilot. The structure does the work of producing the meeting; members do not have to redesign the room every time.
A real cadence, held. Skipping breaks the room faster than almost anything else. The room is what it is because it is consistent.
Documented commitments and an honest review. Without the loop, the room produces good conversation and no compounding outcomes.
Rooms with all of these tend to last for years. Rooms missing any of them tend to slowly degrade and dissolve. The architecture is not subtle — it is just rarely set up deliberately.
Where this sits in the method
Mastermind Groups are Pillar 5 of the Mastery Method. They sit next to Alliances (Pillar 4) because both pillars operationalize the same underlying principle — the observation that aligned minds produce what individual minds cannot — through different structures. The peer working room is one of the most reliable applications of that principle in modern professional life, which is why the format keeps reappearing.
A working mastermind group is one of the most leveraged structures available to anyone doing serious work. It does not require funding. It does not require credentialing. It does not require a platform. It requires a small number of people willing to commit to each other and a structure that holds. The format is older than most of what passes for modern professional development, and it keeps outperforming because the structure is right.
See also: What is a mastermind? · What is a mastermind alliance? · Mastermind groups and collective potential · How to run a mastermind group · Building a better mastermind group